Is Butler County, KY a radon risk area?

EPA's own radon map rates Butler County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Butler County lands in the 41st percentile for radon potential.

Where Butler County sits nationally

About 12,551 people live in Butler County, Kentucky, spread over 426.112 square miles. That works out to roughly 29 people per square mile. Rank 772 by population within its EPA zone puts Butler County at the 25th percentile among zone peers. EPA's geology-based Region 4 groups Butler County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Butler County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Butler County's Zone 2 prediction lands in the gap between the two. Middle-of-the-pack doesn't mean risk-free for any one Butler County address — a moderate county average still leaves individual homes to test either side of it.

If Butler County tests above the action level

Nothing about Butler County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Kentucky's state radon program

Butler County's test kit answers today; a Airthings radon monitor keeps answering for Butler County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.